How far do we want to go? On this one subject I'm content just to know if there's any validity to Cushman's claims that the show was a hit in any ratings sense.
My sense of Cushman's ratings claims is that they were better than they've been purported to have been, not that the show was a hit. I think we all know it wasn't a hit. I remember a second season (I think) critical message from Stan Robertson to GR (and/or Gene Coon) from the Solow/Justman book where the former said "Star Trek is not a hit, definitely not a hit." And I think if Star Trek was a hit they would have picked up more of the cost of producing the series, especially with Desilu being so cash-strapped.